A series
of electrically heated circular tube experiments was conducted to
investigate the influences of physical factors to supercritical RP-3
thermal oxidation coking. The flowing RP-3 kerosene is stressed from
3 to 7 MPa and heated to different bulk temperatures below 450 °C
in a stainless tube (1.8 mm inner diameter and 2.2 mm outer diameter,
1Cr18Ni9Ti) with various heat fluxes. Tube surface and liquid-space
coking were both collected and weighed using different methods to
evaluate the coking characteristics. Besides, some test tube coking
compositions were analyzed for the future investigation of chemical
reactions. The experimental results show that the fuel temperature
is a generated dominant influence factor for tube RP-3 coking, and
its influence is greater than the wall temperature. The system pressure
has no obvious effect for RP-3 with a high distillation range (C9–C12), and the wall coking quantity also
gradually increases with the mass velocity. The average coking rate
is proportional to Re
in. Moreover, the
inlet temperature has little effect on the liquid-space coking, and
the coking particles basically have no threat to the fuel path and
nozzle.
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